Injector



Jan. 6, 1942.

I. P. PEDRICK INJECTOR Filed April 8, 1941 girl/lll;

Patented Jan. 6, 1942 UNITED STATES,fr PATENT OFFICE INJEC'IOR.l` Irenee P. Bedrick, Philadelphia, Pa.,A assignor to William Sellers, & "Company, Incorporated,

Philadelphia,.l?a..a corporation.ofPennsylvania Application-aprire, 1941., seri-a1N0-. as7,a75-

claims.A rc1.' 10s- 275) This invention relates to an improvement in injectors, such as are used for the supply of Water to steam boilers.

As is known, injectors have heretoforeY been provided; with an overflow-valve and a line check valve so arranged that the overow valve Willi be controlled through the medium ofthe line' check valve, to the end that the overflowl valve will be closed when the line check valve opens and will be free to open when the line check valve is closed. Such a structure is, for example, disclosed in United States Patent No. 1,743,684, dated January 14, 1930, to Irenee P. Pedrick.

Now in accordance with this invention there is provided in an injector an improved structurefor the operation of the overow valve under the control of the line check valve.

Having now indicated in a general way the nature and purpose of this invention, I will proceed to a detailed description of a preferred embodiment thereof with reference to the accompanying drawing, in which the single figure is a partial vertical sectional View of an injector embodying a preferred embodiment of this invention.

With reference to the drawing, I indicates a steam nozzle and 2 a water nozzle, both arranged to discharge into a set of combining tubes and forcing tubes 3, 3, which deliver into a delivery chamber 4. The tubes 3, 3 are provided with annular openings 5, 5 which communicate with an overflow chamber 6, the outlet I from which is controlled by an overow valve 8. The delivery chamber 4 is provided with an outlet to a conduit 9, which leads to a boiler, the outlet being controlled by a line check valve I0.

A duct II, connecting at its lower end with a conduit I2, extends into the delivery chamber 4 beneath the line check valve I0, and is closed at its upper end by a pilot valve I3 having a guide I4 extending into the duct. The valve I3 is provided with a stem I5, which extends into a chamber I6 formed on the check valve I0 and closed by a stop I'I through which stem I5 slidably passes. The end of the stem I5 within the chamber is provided with a head I8.

As will now be observed, when the line check valve I8 is closed the valve I3 will drop by gravity and will close the end of duct II. On the other hand, when the line check valve I0 is -fully opened, under delivery pressure in the delivery chamber 4, the valve I3 will be open by virtue of the engagement of head I8 with stop II in the opening movement of the check valve.

The conduit I2 opens into a chamber I9 formed above the overflow valve- 8I and into'which extends a Sylphon bellows 20 secured to a ring 2I-, slidable' inI a guide memberv 252 presenting a seat 26. A pinA 2-3 having a head1 24 secured to the Sylphon bellows 20- extends centrally through a bore in the ring 2| to a point yslightly spaced from the upper end ofl an extension 2'5- of the overflow valve 8; They extension 2-5-v extends through the* ring 2'2- and' into arrenlargement of the bore in ring 2|.

It will now be observed that if the line check Valve I0 be opened under delivery pressure in chamber 4, the valve I3 will be opened and pressure from chamber 4 will pass through conduit I2 to chamber I9. Pressure in chamber I9 will be exerted on the Sylphonbellows, which will cause ring 2l to be forced onto the seat 26 and pin 23 to be engaged with the end of extension 25 to hold the overflow valve 8 closed.

If now the delivery pressure in chamber 4 falls, the line check valve II) will close and in closing will permit valve I3 to close by gravity, thus closing duct II. The pressure in chambers I9 and 4 will equalize through conduit I2, since excess pressure in chamber I9 will raise valve E3. Thus, any pressure which may be trapped in chamber I9 will be instantly dissipated. The overflow valve 8 will lift under delivery pressure and since it is of large area compared to the area of 24 and ZI, there will be no delay until pressure in chamber I9 is dissipated or equalized with the pressure in chamber 4.

When the valve 8 lifts, the end of extension 25 will contact the shoulder 21, formed by the enlarged bore in ring 2|, and ring 2|, pin 23 and the Sylphon bellows 20 will be raised as a unit in the continued opening movement of valve 8.'

When delivery pressure again obtains in chamber 4, pressure will obtain in chamber I9, through the opening of valve I3, and will cause the bellows 20, pin 23, ring 21 and valve 8 to move downwardly as a unit until ring 2l contacts the seatvZ. Then the Sylphon bellows 28 will be compressed causing pin 23 to fully close valve 8 and maintain it closed until pressure in chamber I9 is again dissipated.

It will be understood that it is not intended that this invention be limited to the particular structure described above for illustrative purposes, since it will be obvious that various modication in detail may be made without departing from the scope of the claims appended hereto.

What I claim and desire to protect by Letters Patent is:

1. In an injector, a line check valve, an overflow valve, a Sylphon bellows, means for communicating pressure to said bellows when said line check valve is open and means affording an operative connectionbetween said bellows and said overflow valve whereby said overflow valve will be closed under pressure operative on said bellows said last mentioned means permitting a degree of independent movement of said overflow valve with respect to said bellows.

2. In an injector, a line check valve, an overflow valve, a Sylphon bellows, means for communicating pressure to said bellows when said line check valve is open and means affording an operative connection between said bellows and said overflow valve, said connection, overflow valve and the bellows being movable bodily as a unit throughout the major travel of said overflow valve and fixed means independent of said overow valve to render said connection between said bellows and said overilow valve operative to effect a nal closing movement of said overow valve.

3. In an injector, a line check Valve, an over- Aiiow valve, a Sylphon bellows, means including a pilot valve controlled by said line check valve for communicating pressure to said bellows when said line check valve is open and means secured to said bellows and spaced from said overflow valve when said overflow valve is in fully closed position aiording an operative connection between said bellows and said overflow valve whereby said overflow valve will be closed under pressure operative on said bellows.

4. In an injector, a line check valve, an overflow valve, an extension on said overflow valve, a movable ring embracing said extension and presenting a shoulder to the end thereof, a guide for said ring providing a seat therefor, a Sylphon bellows secured to said ring, a pin secured interiorly to said bellows and extending through said ring to a point adjacent to the end of said extension and means including a pilot valve controlled by said line check valve for communicating pressure to said bellows exteriorly when said line check valve is open.

5. In an injector, a line check valve, an overflow valve, a Sylphon bellows, a movable support for said bellows, means forming an operative connection between said bellows and said overilow valve, means affording a stop for said support for said bellows operative in the closing movement of said overow valve to render said connection operative to effect final closing movement of said overflow valve, and means including a pilot valve controlled by said line check valve for communicating pressure to said bellows exteriorly when said line check valve is open. l

IRENEE P. PEDRICK. 

